Preload is an adaptive readahead daemon. It monitors applications that users run, and by analyzing this data, predicts what applications users might run, and fetches those binaries and their dependencies into memory for faster startup times.

It speeds up app loading time considerably, however may increase booting time a little bit. Given the stable nature of GNU/Linux cold reboots are seldom needed thus one would benefit more from preloading most used applications to RAM. I deem this most valuable on notebook systems that have inherently slow hard drives.